"Sat, 17 Jan 1970 12:33:55"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
12:33:55
General datetime
1970-01-17 12:33:55Z
For Database
1970-01-17 12:33:55
For HTTP1.1
Sat, 17 Jan 1970 12:33:55 GMT